A physically cross-linked polyacrylic acid-grafted hydroxyethyl cellulose and polyvinyl alcohol [PAA-g-(HEC-PVA)]–Fe³⁺ containing graphitic-like carbon nitride (ZnO-g-C₃N₄) was constructed to enhance the adsorption capacity of methylene blue dye (MB). The ZnO-g-C₃N₄ and the grafts were investigated by TEM, ART-IR, XRD and SEM. Swelling properties showed reasonable responses to physical crooslinker (FeCl₃), ZnO-g-C₃N₄ contents and pH. The ZnO-g-C₃N₄ (6%)@PAA-g-(HEC/PVA)-Fe³⁺ has higher swelling ratio (13.18 ± 0.51 g/g) after 6 h. However, it exhibited declined swelling ratio (5.86 ± 0.32 and 7.49 ± 0.42 g/g) at lower pH 3.0 and 5.0, respectively, and (13.48 ± 0.42 and 14.51 ± 0.42 g/g) at pH 9.0 and 11.0, respectively. The swelling data were well-fitted with pseudo-second-order model. The ZnO-g-C₃N₄(6%)@PAA-g-(HEC/PVA)-Fe³⁺ has the higher compressive strength (4.74 ± 0.09 MPa) and lower compressive strain (33.78 ± 1.54%). MB adsorbed completely by ZnO-g-C₃N₄(6%)@PAA-g-(HEC/PVA)-Fe³⁺ given 100 ± 2.06% up to 50 min at dose 3 g/L for 30 mg/L of MB at pH 9. The ZnO-g-C₃N₄(6%)@PAA-g-(HEC/PVA)-Fe³⁺ exhibited 100 ± 2.3% adsorption efficiency (q_t) at dose (300 mg/100 mL). ZnO-g-C₃N₄(6%)@PAA-g-(HEC/PVA)-Fe³⁺ exposed the higher adsorption capacity (q_t) 325.42 ± 13.23 mg/g at MB concentration (30 mg/L). The optimum q_t by ZnO-g-C₃N₄(6%)@PAA-g-(HEC/PVA)-Fe³⁺ at pH (9.0) was (216.82 ± 6.41 mg/g) up to 50 min, however, it was (127.70 ± 5.5 mg/g) at pH 3.0. The adsorption results by ZnO-g-C₃N₄(6%)@PAA-g-(HEC/PVA)-Fe³⁺ were fitting with the pseudo-second-order kinetic model. The Langmuir adsorption isotherm exposed the more applicability than Freundlich and Temkin models.

构建了物理交联的聚丙烯酸接枝羟乙基纤维素和聚乙烯醇 [PAA-g-(HEC-PVA)]–Fe ³⁺含石墨状氮化碳 (ZnO-gC ₃ N ₄ ) 以增强吸附能力亚甲蓝染料 (MB)。通过TEM、ART-IR、XRD和SEM研究了ZnO-gC ₃ N ₄和接枝物。溶胀特性显示出对物理交联剂 (FeCl ₃ )、ZnO-gC ₃ N ₄含量和 pH 值的合理响应。ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe ³⁺6 小时后具有更高的溶胀率 (13.18 ± 0.51 g/g)。然而，它在较低的 pH 值 3.0 和 5.0 下分别表现出下降的溶胀率（5.86 ± 0.32 和 7.49 ± 0.42 g/g），在 pH 值 9.0 和 11.0 下分别表现出（13.48 ± 0.42 和 14.51 ± 0.42 g/g）。膨胀数据与伪二阶模型拟合良好。ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe ³⁺具有更高的压缩强度（4.74 ± 0.09 MPa）和更低的压缩应变（33.78 ± 1.54%）。MB 被 ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe ³⁺完全吸附，以 100 ± 2.06% 的剂量以 3 g/L 的剂量对 30 mg/L MB 进行最多 50 分钟在 pH 9. ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe³⁺在剂量 (300 mg/100 mL) 下表现出 100 ± 2.3% 的吸附效率 (q _t )。ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe ³⁺在 MB 浓度 (30 mg/L) 下暴露出更高的吸附容量 (q _t ) 325.42 ± 13.23 mg/g。ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe ³⁺在 pH (9.0) 下的最佳 q _t为 (216.82 ± 6.41 mg/g) 长达 50 分钟，然而，在 pH 3.0 时为 (127.70 ± 5.5 mg/g)。ZnO-gC ₃ N ₄ (6%)@PAA-g-(HEC/PVA)-Fe ³⁺吸附结果符合拟二级动力学模型。Langmuir 吸附等温线比 Freundlich 和 Temkin 模型具有更大的适用性。